2.  Download data ps2. This contains information on 400 hypothetical fast food stores located in East Pennsylvania or New Jersey. Suppose that the minimum wage of $5 was introduced in New Jersey in 1990. The variables are:

- .rm_id = firm identification number

- time = 0 in 1989 (before) and 1 in 1991 (after)

- region = 0 if the .rm is located in Pennsylvania and 1 if it is located in New Jersey

- full = # of full time workers

- part = # of part time workers

- wage = hourly wage

- price = price of standard burger

(a) Provide summary statistics for the whole sample.